US Bridges

Lacomb Road over Plum Brook

Good

St. Lawrence County, New York · .2 M NE Mill + Lacomb RD · Structure no. 000000003341420

Built
2023
2 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
140
2018 count
Owner
County
County Highway Agency

About this bridge

Lacomb Road over Plum Brook is a prestressed concrete box beam or girders - multiple carrying Lacomb Road over Plum Brook in St. Lawrence County, New York. It was built in 2023, so it is 2 years old, younger than the New York average of 53 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 140 vehicles a day, roughly 6% of them trucks, projected to reach 196 by 2038. The structure is 62 ft (18.9 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesLacomb Road
CrossesPlum Brook
Location.2 M NE Mill + Lacomb RD
CountySt. Lawrence County
StateNew York
Coordinates44.85049, -74.9081
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length62 ft (18.9 m)
Longest span58 ft (17.7 m)
Deck width28 ft (8.6 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2018)
Projected traffic196 by 2038
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$692,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lacomb Road over Plum Brook built?

It was built in 2023, making it 2 years old in 2025.

What condition is Lacomb Road over Plum Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Lacomb Road over Plum Brook carry?

About 140 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is Lacomb Road over Plum Brook?

The structure is 62 ft (18.9 m) long with a longest span of 58 ft (17.7 m) and a deck 28 ft wide.

Who owns Lacomb Road over Plum Brook?

It is owned by the County Highway Agency.